int xenbus_read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node)
{
int err = xenbus_gather(XBT_NIL, xendev->nodename,
id_node, "%i", &xendev->otherend_id,
path_node, NULL, &xendev->otherend,
NULL);
if (err) {
xenbus_dev_fatal(xendev, err,
"reading other end details from %s",
xendev->nodename);
return err;
}
if (strlen(xendev->otherend) == 0 ||
!xenbus_exists(XBT_NIL, xendev->otherend, "")) {
xenbus_dev_fatal(xendev, -ENOENT,
"unable to read other end from %s. "
"missing or inaccessible.",
xendev->nodename);
free_otherend_details(xendev);
return -ENOENT;
}
return 0;
}
int read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node)
{
/* add for vmdq migrate.When the device is vmdq_vnic ,return */
if(0 == strcmp(xendev->devicetype, VMDQ_VNIC)){
return 0;
}
int err = xenbus_gather(XBT_NIL, xendev->nodename,
id_node, "%i", &xendev->otherend_id,
path_node, NULL, &xendev->otherend,
NULL);
if (err) {
xenbus_dev_fatal(xendev, err,
"reading other end details from %s",
xendev->nodename);
return err;
}
if (strlen(xendev->otherend) == 0 ||
!xenbus_exists(XBT_NIL, xendev->otherend, "")) {
xenbus_dev_fatal(xendev, -ENOENT,
"unable to read other end from %s. "
"missing or inaccessible.",
xendev->nodename);
free_otherend_details(xendev);
return -ENOENT;
}
return 0;
}
static int talk_to_otherend(struct xenbus_device *dev)
{
struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
free_otherend_watch(dev);
free_otherend_details(dev);
return drv->read_otherend_details(dev);
}
int xenbus_dev_remove(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
DPRINTK("%s", dev->nodename);
free_otherend_watch(dev);
free_otherend_details(dev);
if (drv->remove)
drv->remove(dev);
xenbus_switch_state(dev, XenbusStateClosed);
return 0;
}
int
talk_to_otherend(struct xenbus_device *dev)
{
int err;
free_otherend_watch(dev);
free_otherend_details(dev);
if (dev->frontend)
err = read_backend_details(dev);
else
err = read_frontend_details(dev);
if (err)
return (err);
dev->otherend_watch.dev = dev;
return (xenbus_watch_path2(dev, dev->otherend, "state",
&dev->otherend_watch, otherend_changed));
}
